/Engine/Source/Editor/SequencerCore/Public/MVVM/Selection/SequencerCoreSelectionTypes.h
Selects a range of keys, optionally supplying a boolean to receieve a value indicating whether any were newly selected or not
template<typename RangeType> void SelectRange ( [TViewModelPtr](API\Editor\SequencerCore\TViewModelPtr)< ModelType > InOwner, RangeType Range, bool * OutAnySelected )